Duplicating device



April 5 19.2%

E.1 E, sTRAWN A DULIC'TING DEVICE Filed Nov. 6, 1925 Patented pr. 5, i927.

UNiTED 'STATES razas-ee PAT-Eur .torrie ERVIN STBAWN, '0F CLEVELAND,Oil-3110,. ASSIGNOR 10.A I`{THU-R SaGILMN, CLEVELAND, OHIO. A.

y DUPLICATING DEVICE.

Application led November 6, 1925. Serial No. 67,386..

My invention relateso to devices for making a .copy or copies of matter written or typed upon an original sheet, its object -being to effect such result in an efficient and economical manner. l

The invention may be advantageouslyapplied to a typing machine and thereby eliminumber' of sheets laid in succession thereon,.

without further application of such material and without smudging the said backs of the sheets.

By platen I mean a' base member of suincient stiffness to maintain uniformity of its contour while being -manipulated and which may form a firm base for receiving the pressure of the writingor printing instrument, in. contradistinction to a sheet of carbon paper which is. extremely iexible, folds and wrinkles easily while being handled and cannot of itself form such a base.

The said invention consists of means hereinafter fully described and -particularly set forth in the claims.

The annexed drawings description set forth in detail certain means for carrying out my invention,-the disclosed means, however, constitutingbut one of the various mechanical rforms in which the principle of my invention may 'be employed.

In said annexed drawings: Figure 1 represents a perspective of a `simple form of my invention, showing an original record sheet and a. copy thereof in position on the device. Y Fig. 2 represents a fragmentary enlarged and exaggerated cross-section. 'f A A Fig. 3 represents a plan of a .fragmentary portion of a typewriting machine embodying my said invention as applied thereto.

Fig. 4 represents a section taken upon the plane indicated by line IVl--IV n'Fig. 3.

.A Referringlirst to the form of my invention illustrated by Figs. 1 vand 2, I provide a flat platen 1 made of any -suitable material such as a sheet of brass or'steel and -having a roughened'jsurface forming a. .mul-

tiplicityoffm'inute wellsas shown in' Fig. 2.

and the following .plication of carbon materialiA I`his roughened character of surface may be inherent in the material from WhichA the platen is made or maybe imparted thereto by etching, sand blasting, or any other. suitable mamier. 1 i

able solid and hence dry carbon material I then apply to such surface a transferconsisting of a'suitable Wax having coloring matter .such as lamp-blackI incorporated therein in the required amount and which may be in the form ofa cake. Thisma- .terial is spread over` the entire surface of the platen by rubbing the cake thereon, and the platen then wiped so as to remove the superfluous carbon material, spread same' uniformly upon the platen, and just ill thewells or depressions. A sheet of paper 2 such as tissue paper, isflaid upon the-platen and the original sheet 3 is laidv upon it, as shown in Fig. 1.

Matter may now bewritten uponthe upper surface of the sheet-3 and the pressure transmitted to the sheet 2 4and the "platen surface, in so doing, causes' the carbon material of the platen to be transferred. to the back o f .sheet 2 to reproduce the written matter on such sheet back. This matter may scribed in connection with the previously.

`90 ply the carbon material, and wipesameas before. Such application, may be made by described flat platen. To this surface I apholding the cake of carbon material against the platen surface and then turning it by hand. The wiper may then be held. against the surface and the platen-likewise turned by hand. s

Vbe read from thefront face ofisaid sheet l A translucent sheet 2 and a superposed' original sheet 3 are inserted in the machine with the sheet 2in contact with the platen as shown in' Fig. 4.

Theinachine now l the original sheet 3, impressions of the char# acters 'will beinadejupon' the 'back of sheet 2 and-the latter hence 'will' form aco y.

I have found that quite` a large num i' 'of copies may be made with buta single'lapf' the invention :I vhave also found that. hen is applied to a typewriting machine, .it opbeing operated to .type

" the trade as the Noiseless typewriter, is a` l. machine, as shown in holder may have associated with it a wiper I erstes with particular successv when applied to a machine employing what I Shall term a r1,g h tline y vtype-bar, that' is ,a type-bar whose path of movement is in a straightline,

and -I Ahave illustrated the invention as apz j plied to such a machine. What is known in machine employing such a type7bar.

In order to always have the carbon material-'and wiper read to hand a holder 5 may Vbe provided in wh1chthe cake 6 of carbon material may be yinserted .so as to extend along the platen 4. The-holder may be pivotally-mounted upon two swinging arms 7 -7 pivoted upon the frame. of the typewriting' Figs. 3 and 4. This 8 consistin'. of a flexible 'strip of material such as rub er.

By means of thisarrangement, either the cake 6 or wiper may, when required, be appliedvto the platen, and when not in use be swung u out of position, as shown in dotted lines in ig. 4, where it may be held by'any suitable means (not shown).

Theterm carbon material as herein used, is intended to include any transferable solid material similar to vthat used tomake carbon paper and which may be of any desired color required to contrast with the color of the pa r on which the copy is made.

- at I claim is:

1. In a typewriting machine, the combination with a. cylindrical platen having a surface' adapted to receive and retain a transfer i material; of a bar of such vmaterialin solid such material may be AapplieI form,mountedu on the typewriter and movable toward an from said platen, whereby said'material may be applied to the latter when required.

2. In a typewriting machine, the combination with a. cylindrical platen having a surmaterial;l of a bar of such'material" in solidv -orm and substantially longitudinally coextensive with said platen, mounted upon the typewriter and movable toward and from the face 'adapted to receive and retain a transfer.,v

platen, whereby substantially the entire surtion with a cylindrical laten having a hard.'

permanent surface roug ened to form minute wells of aframe movably mounted in prox- -imity to said p laten and carrying a holderv pivotally mounted onzsaid frame, and provided on one side with a bar of solid trans'l fer material and upon the other side with a wiper, whereby either the bar 'or wiper may be applied to the platen as required.

Signed by me this 31st day of October, 1925,l

ERVIN E. STRAWN. 

